2nd NetBios name for a Windows 2003 Server

I need to add a second NetBios Name to a windows 2003 server to act as a DR node for a print cluster so that users can still print in the event of the Printer cluster Nodes (Site) going off line. I have used Printmig to install all the printers on the windows 2003 file server and as this server is also the DR file server I need to give it a second NetBios name so users can still print without changing any settings. I have crated a CNAME for the printer cluster and can ping the name fine. I also set the option for DisableStrictNameChecking and added a reg key for OptionalNames (I think I got it right) but my XP client can still not print.